The Bifrost also known as the Rainbow Bridge is used by the Asgardians an ancient race of god like beings to travel from Asgard to any of the Nine Realms and worlds beyond. It is guarded by Heimdall the all seeing based from his Observatory. 
Marvel Cinematic Universe (Earth-199999)
The Bifrost Bridge is a "Wormhole" or "Einstein-Rosen bridge", a device that allows shortcut connecting two separate points in spacetime, used by the Asgardians. It is guarded by the warrior Heimdall at his Observatory. The Bifrost Bridge is a link between all the Nine Realms, but can be opened only if Heimdall permits it: the bridge is in fact much too powerful, and it would destroy all realms if left opened.
Thor, Loki, Sif and the Warriors Three used the Bifrost to reach Jotunheim, thus reigniting an age old conflict with the jotuns. Loki's machinations behind this affair culminated in an attempt to destroy Jotunheim by leaving the Bifrost open on that realm, but Thor foiled the plan by destroying the Bifrost with Mjolnir instead.
With the Bifrost destroyed, although Thor was able to travel to Earth due to Odin summoning a great deal of dark magic, the Asgardians became cut off from the worlds that they protected, and the Nine Realms were consequently plunged into chaos. They hastily rebuilt the bridge, which Heimdall subsequently re-powered with the Tesseract, and then set forth on a campaign to rid the Nine Realms of the marauders that had grown in strength during their absence. During this time the Bifrost was put to frequent use transporting Asgardian raiding parties to the other realms, and to bring their prisoners back to Asgard.
Marvel 2099 (Earth-928)
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- Appearances of Bifrost
- Minor Appearances of Bifrost
- Media Bifrost was Mentioned in
- Location Gallery: Bifrost
- Images related to Bifrost
- Marvel Staff members who were born in Bifrost
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